ADD: Vickers Viscount 757 Series (new tractive effort formula for turboprop)
Change: Tractive effort for propollers, used new formula to convert SHP -> kN
Fix: uppercase in PNG image
FIX: uppercase in PNG image
ADD: More street names
Merge branch 'Payload' of https://github.com/Milkogit/simutrans-pak128.britain.git
CHANGE: Increase the catering level of the Vickers Viscount