i think a 159 from waterloo to Bristol would be a cool route to have and there would be lots to see within London and Salisbury Westbury bath and Bristol this is old route as this no longer runs due GWR running on the over half of the route and there being trains to London from Westbury and bath and also Bristol so they stopped running it as it used to run as followed 9 car London to Salisbury rear 6 to exert st dived and front 3 to Bristol stopping at stops like Warminster(stopping trains also start from this stop) , Westbury witch is also a London change over point as well as to the very south west of England and has up 4 trains at any time going to Bristol some are supper trains starting from Westbury and Warminster both go Bristol parkway there as also a Westbury to Swindon in the day time and at night time it makes it way to gloater (this train does not go to Bristol but cuts over to Chippenham on a single line track there's also Westbury yard that has stuff going on all the time . bath is 2 platform train station and all trains stop at bath or well bath spr is its full name then there's the stop about 3 mins down called Oldfield park only stopper trains stop there Bristol has lots of times in and out all the time some downsides are request stops where train can stop there but only when requested to