There are too many variables and each country differs.
all roughly
UK (sg) 9' x 13' - some places can take more but this is go (almost) anywhere..
South Africa (42") 10' x 13'6"
Zimbabwe(42") 10'6" x 13'6"
etc............
Gavin
Linslade
Bedfordshire
UK
Garratt Locomotives
[
www.beyergarrattlocos.co.uk]