[FB] Freebuild Railway branch lines

Flyovers and journeys in both directions for the Freebuild Railway's two branch lines. The South Town branch existed when the rest of the Forthspen area was built in December 2023, but the West End branch has only existed for a few months (built sometime in mid-2024). Both branches are served by a shuttle service as demonstrated in this video, however a couple of the West End shuttles are cut back to Lothel Minor. Also, in the peak time on weekdays, there are also one or two services that connect both (half of which use the connecting spur, so it's not as seldom-used as I made it sound...), with such a service using both the possible routes between Forthspen Junction and South Town. That means that both Riches Hill (on the branch) and Mayley (on the main line) get a direct service on the two branches. How does it work? Well, there's two services that do the normal shuttle from Great Lothel to West End, then instead of using the reversible bay platform at Lothel Minor, they use the normal Up ('through') platform and go along the main line to Forthspen Junction (via Whimford) and Mayley before using the spur to reach South Town, then return to Great Lothel using the same route. The other pair of services at the Forthspen end do the normal shuttle from Forthspen Junction to South Town, then return via their normal route and use platform 2 (Down) instead of their normal platform 1 (bay). After travelling to Lothel Minor (via Whimford), they go down the branch, do the same journey in reverse and terminate at South Town using the branch.