Single horse + hackney carriage = comfort 150 (look at the chart)
Double horse + omnibus = comfort 114 (look at the chart)
It's very irritating that -devel gets badly broken so routinely.
EDIT: I've fixed this one, on my github in my jp-devel branch.
The bug was an improper computation of comfort when there was exactly one p****enger vehicle.
While I was at it (eyeroll) I fixed two other logic bugs in the computation of comfort related to standing p****engers.
Thank you for the fixes! Much appreciated.