[Tagging] railway=rail vs. railway=subway

[Tod Fitch]

> On Nov 23, 2016, at 7:45 AM, Michael Tsang <miklcct at gmail.com> wrote:
> 
> I should clarify that the level crossing of light rails should be not actively 
> protected, i.e. do not have fences which come down before the train passes. 
> One of the major criteria between tram / light rail and metro / full-size 
> train is the ability to run within other traffic.
> 
> Do you have any examples where a freight train have to wait for a red light at 
> a street intersection, or runs on a stretch of street with motor traffic?
> 

Jack London Square in Oakland is a famous example: https://www.youtube.com/watch?v=ki3QCZhacHY