Rails without half bricks cannot be removed(Sorry, English is not my language)
you can Look gif diagram

Are you using Steam 'n Rails 1.0.2? If so, this is a known issue and is fixed in 1.0.3. Please let me know, so I can close this issue if it is resolved by updating.

Oh, I didn't notice that 1.0.3 has been updated. After the update, this problem has been solved