I'm sorry to have to report a finding in Pak128.Britain 1.07 (not in Experimental AFAIK).
The livestock driver has a weight of 0t. But Simutrans Experimental (and probably standard too) can't handle that. If you set the weight of a vehicle to 0t, it has infinite speed when empty. Setting the weight to 1t solves the problem.
On a sidenote, I get the impression that (in both PakSets) the livestock driver is incorrectly spelled as livestock drover. This might be a small tweak to do.
If you agree with both points, I can upload my .dat file with both changes for you.
Nah, it is supposed to be like that, cf. http://en.wikipedia.org/wiki/Drover
I stand corrected on the spelling. Thanks, learned something again.
You are correct with the weight - will fix that. Drover is the correct term though (old-fashioned quirk of the English language!)
The other vehicle with a 0 weight in pak128.brtiain standard is the "man on a bike", and it also needs to be changed to weight 1. (This change was already made in experimental.)
These should both be fixed now in Standard.