Jerry Whittle from Belleville Illinois on 4/15/2020 9:07:45 AM:
I've seen trikes on the Katy and there doesn't seem to be a problem at all. I know of one 80 year old who rode his trike from end to end in both 2017 and 2018. The trail is plenty wide in most places.
Electric assist also isn't a problem as long as you aren't going too fast. Finding a place to recharge can be as issue if you are going long distances.