Zurich, Berlin, Copenhagen and Munich have their S-trains. Parisians ride the RER; Long Islanders, the LIRR. Torontonians brave snowdrifts on the GO, perhaps while grunting ‘Eh?’ at one another after maple syrup-sogged moose chases. (I haven’t visited Canada in awhile.) Commuter rail is the inadequate and often misleading moniker for transit services of this type. Bigger…