Hi,
If you're looking for railway civils work that is track-based (ie: green field infrastructure projects), then a 360 ticket will be fine. The work will be very similar to what you've experienced elsewhere in the construction industry.
If you're talking about working on the railway as a 360 driver (so a road-rail machine), the work is a lot different. On a typical railway shift (which would normally be a Saturday night), 360 machines (road-rail) are often used on track for moving materials and equipment to a work site from an access point, usually by towing a trailer. There'll also be a bit of lifting (precast LOC bases etc). There are bits and pieces of excavations and the like but not in any real substantial amount, simply because there isn't the time. You don't tend to get possession until after 2300hrs, isolation after 0000hrs, then get your machines on track by 0030hrs. You then will be required off-track by about 0430hrs to allow for the hand back procedure. You don't get a great deal done in that amount of time!
Stuff like drainage renewals and ducting works would be done by 360 machine but usually on long possessions/blockades (generally 54 hour). But, you'll usually find those type of possessions are on bank holidays/weekends/festive periods.
In a nutshell, 360 machine work on railway infrastructure projects which are away from the existing live railway are very similar to what you'll have experienced previously. If you want to work on the railway on road-rail machines, brace yourself for weekend/night/bank holiday working. There are examples where you can work on road-rail machines during the day, such as the Reading remodelling, but even that will be shift based and you could be on days or nights.
If you do fancy the road-rail 360 idea, get in touch with Shovlin, Paul John etc.
Hope this helps.