Two Tunnels Railway Races - March

Brickfields Park, Bath

Organiser's Description

A fast out and back course with lots of PB potential through Bath's Combe Down and Devonshire Tunnels - disused railway tunnels which until 2013 were sealed and inaccessible. This unique and truly special race takes in many of Bath's beautiful attractions, and also has the longest underground sections of any running race in the UK!

This is the first of 4 events in 2020, which offer a variety of events for all the family - an ultra, marathons, half marathons, 10ks, 5ks, and Colourburst runs for the kids. Start and finish will be in Brickfields Park in the middle of the City - a green park with children's playground, a great spot to sit and enjoy a picnic after the race.

Start Time



  • 500m Colourburst No min age
    £8 CLOSED
  • 2 km Colourburst No min age
    £10 CLOSED
  • 5km Min age 12yrs
    £18 CLOSED
  • 10 km Min age 16yrs
    £23 CLOSED

Brickfields Park, 47 King George's Rd, Bath BA2 1LX

The Two Tunnels events are being staged at Brickfields Open Space (BA2 1LX) in the city of Bath.

If you live in Bath please consider walking or cycling to the site in the spirit of our event partner Sustrans. We will provide bike racking for cyclists.

If you are driving to Bath please park at Odd Down Park & Ride (BA2 8PA) and catch the Two Tunnels bus to the race site. From here it is a 500m walk to the race site which will be signed with pink or orange signs.

Oldfield Park train station is approximately 800m from Brickfields.

All our runners receive a top of the range custom medal, as well as a buffet of fresh fruit and other tasty treats.

Running vest


Bag Drop

A number of prizes are awarded, determined by the total number of finishers (male and female combined) in a given race distance.

A green park complete with children's playground and table tennis table, a great spot to sit and enjoy a picnic after the race.

There are two distances to chose from; 2km and 500m, each with multiple colour stations along the route! All runners will be given a white t-shirt to wear (small, medium or large) and we strongly recommend that you bring goggles or sun glasses to keep the colourburst out of your eyes. We also encourage mums and dads to consider a change of clothes and shoes for the car ride home :-)

These events are open for runners of all ages, particularly runners who would be too young to do our 5km race (min age 12). There is no minimum age for these colourburst runs and they are not timed events! Registration is £10 (2km), £8 for 500metres and includes a white t-shirt, custom medal and a selection of refreshments. Please note it's £2 extra to register on the day

The colourburst is infact 100% food grade corn starch with coloured dye, it is 100% safe, edible but not at all tasty so eating it is not encouraged, and 100% biodegradable.


This route is an officially measured accurate route. The whole route is on a fast tarmaced surface with gentle gradients of no more than 2% in only a few places on the route. This makes this a great fast course, certainly the fastest Relish Running course out there and there is a great chance of recording a PB on this route! The official course measurement reference number is 236/2201.


The whole route is on a fast tarmaced surface with gentle gradients of no more than 2% in only a few places on the route. This makes this a great fast course, certainly the fastest Relish Running course out there and there is a great chance of recording a PB on this route! The official course measurement reference number is 236/2201a

These events are set off in waves of approximately 100 runners set off every 10mins. This is because of the relatively narrow nature of the route. Each distance will have multiple waves to choose from when you register.

The waves are organised by predicted finish time, with one wave open to runners of all predicted finish times to make it easier for people who wish to travel together. Please confer with friends and family before you register to ensure you select the same wave if you wish to start together. The different start times are fully accounted for in the results so you pick any wave and get an accurate finish time.

Runners with buggies are very welcome. You need to start at the back of your wave as there is some narrow, uneven ground after 150m for which it would be best if you were not in the middle of a group. This event is not suitable for Canicross. Please read through all the information carefully below ahead of time so you are familiar with how to arrive on site and how the waves of runners will be organised. Please check the The Two Tunnels Park & Ride service schedule in advance. Each service can hold a maximum of 90 people per journey and we are expecting 600 runners to use the service. Please bring your own water for the before the race. We are set in a field and cannot top up our water, which is needed for runners after their race. There will be caterers on site, and there is also a corner shop nearby. Thank you for your understanding. Schedules Provisional schedules are shown below.

1st March PROVISIONAL Schedule

10th May PROVISIONAL Schedule

12th July PROVISIONAL Schedule

16th August PROVISIONAL Schedule

The event takes in some fantastic city centre sites. We are making use of public footpaths and not closing any roads. Therefore there are places where runners will have to cross potentially busy roads. All major crossing points have either Zebra or Pelican Crossings and will also be marshalled. The marshals do not have the power to stop the traffic. You must wait and make your own decision as to when to cross the road. You may have to wait a few seconds for a light to change so please be patient and take the opportunity to catch your breath. Anyone deemed to make an unsafe road crossing by one our marshals will be disqualified. Whilst this is a race, your safety is our highest priority and the same rules of the road apply during the race as at another time – do not put yourself or others runners at risk for the sake of a few seconds!

All paths used by the race are open to the general public, many of whom use the routes as their regular walking routes. Please make the event a success by being polite and courteous to the others users of these paths so that has a positive impact on everyone involved.

To ensure Half Marathon runners complete the course the runners will be required to grab a coloured elastic band at Feed Station 4, by the Bath weir in the centre of town. Half Marathon runners will be expected to be carrying 1 band when they cross the finish line.

Please do not run with music players which have in-ear headphones, only bone conducting headphones are permitted in line with UK Athletics rules who license these events. It is very important that you can hear the marshals instructions, be aware of other users in the tunnels (think cyclists ringing their bells to come past you!) and traffic on the sections of the course that cross roads. Thank you!

Two Tunnels Code of Conduct

We are working closely with out partners Sustrans and the Two Tunnels Group who worked on the reopening of the Two Tunnels over a 7 year period! Please read the Code of Conduct they have developed as we will be using it during our event, thank you!

All Users please - Share the path so that everyone can enjoy it - the path will remain open to the public during the event. - Keep to the left and please keep in single file where possible and unless overtaking - Leave no litter - please leave empty cups or energy bars at the feed stations. If you can run with a full wrapper, you can run with an empty one :-) - Respect the privacy of adjoining properties and landowners- Be courteous and patient with other path users, particularly children. Please make yourself known if you are approaching another use in the tunnel - Be aware that mobility scooters may use the path. Motor cycles and horses are prohibited

Walkers please - Avoid spreading out across the width of the path - be aware that others may wish to overtake you

Cyclists please - Control your speed: our shared use path is for sharing not speeding- Be careful on downhill sections- Take care when passing other users- Slow down on narrow stretches or if you cannot see clearly ahead- Be particularly careful at junctions or places where visibility may be poor- Use a bell to let other users know that you are approaching- Do not assume people can see or hear you approaching- Use lights when visibility is poor

Dog Walkers please - Keep dogs under control- Keep dogs on a lead when using the tunnels- Clear up after your dog

Loading Map

Sorry, booking has closed for this event 🙁

  • 500m Colourburst No min age
    £8 CLOSED
  • 2 km Colourburst No min age
    £10 CLOSED
  • 5km Min age 12yrs
    £18 CLOSED
  • 10 km Min age 16yrs
    £23 CLOSED

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Write a review and you’ll be entered into a monthly draw to win a pair of running shoes of your choice from Pro:Direct Running.

Lovely scenery and great support

This is a lovely scenic route; lots of miles along the canal, some beautiful views of the viaducts and the tunnel stretches kept things interesting. The support was excellent and the Marathon ran smoothly. This had a very relaxed and friendly feel to the day. There was no on site parking and the park and ride was a bit of a faff for being so far away from the city centre, similarly, the start/finish line are a little away from the city centre making it a bit tricky for family to support. The route map could be a little clearer to help family track the route and offer support, but the route was very clear on the day itself.
If the start/finish were in a more central location, or a closer park and ride was arranged, I'd definitely give this five stars - but the positives; a beautiful route, organised well, with super friendly people gets this four stars from me.

Matt Potts / Aug 19, 2019

10k route

I was so impressed on how well organised it was! The 10k route is nice and flat as you would imagine it would be being an old railway line. Lovely and cool through the tunnels, really impressive! If you’re at your infancy in running or you want a PB then this is ideal!! This is definitely one for my running event calendar!!

Lee Jones / Aug 19, 2019

Underground, overground....

Interesting, well-organised race through tunnels, villages and along a great stretch of towpath; brilliantly marshalled throughout; main difficulty apart from the relentlessness of waterside miles was weaving through Sunday crowds in the city centre stretches; rates high as a 'special' race.

John Cooper / Aug 19, 2019

Half marathon route

There is a cheeky bit of hill work mile 3-4 then goes flat along the canal found it difficult with lack of support on this part, very very cheeky hill at the end but was well organised

Gemma Dooley / Aug 19, 2019

Super well organised event

I did my first Two Tunnels event yesterday and was very impressed with the organisation. Getting there was easy, park and ride buses laid on. There were several waves for each distance and the tunnels made running a whole new experience.

David Hudson / Aug 19, 2019

Absolutely unique

One tunnel is 1KM ,
Other is 1 mile.
you go through them and back, twice.
So you spend the majority of this run underground and out of the heat and sun.

Absolutely unique run and I really enjoyed it, very flat

Eddie Milner / Jul 17, 2019

An extravagant route!

One of the best extravagant routes for a PB on a half marathon!
Fantastic tunnels to cool off in whilst undergoing the route and an overall flat course; to enable a PB!

Hannah Goodwin / May 14, 2019

So much fun!

Angus James / May 13, 2019

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