Pocket Edition Minecarts Not Working

Pocket edition minecarts not working

*What I expected to happen was when I placed rails and then put a minecart on them and tapped the minecart I would get in them

*What actually happened was I tapped the minecart and it set off so I placed another one and tapped it and it broke.

Steps to Reproduce:
1. Place a minecart on rails
2. Tap it