Local Budgets

[Markster]

I wonder what the history is that resulted in Margaret St. getting a grade separation but not Lancaster?

Having done a little investigation into it, it seems that Margaret got one because it's always had one.
Before the recently demolished bridge was built in the 50s, there had been a wooden bridge before that dated back to the 1910s at least. The geography around there naturally supported a bridge over the rail line, and with wooden construction being an option, it was relatively cheap.