Railroad handcar - photo

[Gadgeteer]

Hmmm, no seat belts on the bench. But, it does look like there is a foot brake for each pedaler, and seat-retention cables for the pedalers' seats. Also, there are front bumpers, just in case a large animal is encountered, while rolling down the track. It appears that the pedals are in sync, so that the people providing propulsion apply force in tandem.