Two Tunnels Railway Races - october

Brickfields Park, Bath
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Relish Running races has provided covid-19 safety information for this event.

Organiser's Description

A truly special race that not only takes in many of Bath's beautiful attractions, but also has the longest underground section for each race distance in the UK!

Cutting right under the city of the Bath, the two tunnels offer a truly unique running experience. The Somerset & Dorset Railway closed in 1966 and until April 2013, the tunnels had been sealed and inaccessible. Thanks to the hard work and dedication of the Two Tunnels Group and Sustrans over a period of 7 years, the two tunnels now have a new lease of life as a shared use path. The first tunnel, the Devonshire Tunnel is 408m long and the second tunnel, Combe Down Tunnel is 1672m long. Both tunnels are well lit and well surfaced and have recently been converted into a shared use path for the enjoyment of runners, walkers and cyclists looking to make the most of the city whilst remaining on flatter ground.

With an ultra marathon, 50km relay, marathon, 3 different half marathons, 2 different 10kms, 5km, 2km and 500m Colourburst races there are events for all the family, and if they are not taking part, bring your friends and family to cheer you on. Our start and finish is at Brickfields Park in the middle of the city which also has a children's play ground and is a great spot to sit and enjoy a picnic after the race.


  • 500m Colourburst No min age
    £8 BOOK
  • 2 km Colourburst No min age
    £10 BOOK
  • 5km Min age 12yrs
    £20 BOOK
  • 10 km Min age 16yrs
    £25 BOOK
  • Half Marathon Entry Min age 17
    £35 BOOK

Our new event format has been approved by Public Health England the Safety Advisory Group for Events. We have very detailed plans to ensure social distancing measures are in place through out your race day, along with additional hygiene measures in place through out the venue.

It is very important you familiarise yourself with our updated event plan, check out our safety plan and measures, so you can not what we will be asking of you on race day, and what you can expect from us. You can see all this info on our Safe Race page.

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.

We are very happy to b supporting the ongoing work of Sustrans in maintaining the Two Tunnels by contributing £1 per runner to their charity. Looking to fund raise as part of your run, why not raise money for Sustrans? You will get a lovely free running vest and other goodies. Find our more here. In 2019 we donated £5,254 to Sustrans.

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.

Individual Races: Some distances have multiple route options, known as Tickets, across the year, some repeated on each date, others available only once a year. Please click on the route options off the main Two Tunnels menu for more info on which routes are offered on which dates. You can enter one or more races at any time.

Challenge Series: Two Tunnels Mini Challenge = 5km + 10km + Half. Two Tunnels Challenge = 10km + Half + Marathon. The distances can be run in any order over the year. If you run these combination of events over the year, not only will you take home 3 medals, but also a laser engraved glass trophy which is awarded to ALL finishers. If you sign up race by race, please email us at least 4 weeks before your final event so we can order you a trophy. We can not guarantee a trophy after this point as producing one offs, shipped from abroad, would be cost prohibitive.

You can run multiple races on each day, please just make sure that the schedule would allow for this. Please allow some extra time between races as we hope to be able to reduce the time intervals between the races as normality returns. Provisional schedules can be found here.

All runners collect one custom medal with each race and there are four medals to collect over the year. Scroll down for a preview of the medals and trophy design for this year. If you are doing the challenge race, you can enter any distance race as your fourth race to get the fourth medal.

Competitor information Provisional Schedule
Loading Map

Select your race using the check boxes

Then select a wave to run in based on your predicted finish time under 'Race Extras'

Then select your age and gender category

1. Choose your race

Race Extras

    Wave Selection Please tick the box and select your preferred start wave:
  • Category Please tick the box and select your gender and age category


2. Competitors Details

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3. Additional info

Please state your Predicted Finish Time (HH:MM:SS)

If you wish to run with another run please select the SAME DISTINCT finish time eg 55mins 01 seconds, rather than 55mins.

If under the age of 18:

Fundraise for Charity

Tick below to receive information about doing this event for a charity. Your contact details will be shared with the selected charity. Kit

Good for sweating in, good for relaxing in and gentle on the planet too.

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Delivery included. All kit is sent to the competitor's address above.

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Order summary

Two Tunnels Railway Races - october

Race Entry £
Kit Extras £0
Booking Fee £0
Total Cost £

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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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