ALWAYS KEEP IN MIND, you should use railbikes ONLY on ABANDONED lines!!
To proceed into a section of track, the train driver/guard must physically possess an object, typically handed over at a station just before the section, and returned just after.
[1] With some exceptions – the Severn Tunnel e.g. was switched to axle counters already in 1987 because track circuits proved too unreliable within the (wet) environment of the tunnel.
[0] https://hemomkringvandring.se/wp-content/uploads/2020/06/IMG...
See also: Shweeb - https://www.nzherald.co.nz/travel/shweeb-how-new-zealands-hy...
A normal bicycle can be lifted in one hand. This looks more unwieldy but not too much heavier. It shouldn't be hard.
(If two riders are both so oblivious that neither sees the other coming from at least a quarter-mile off, they deserve to crash.)