Looking on the internet deeply has found these results:

on the subway is the most popular phrase on the web.

in the subway 1291,000 results on the web	on the subway 120,400,000 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
Apr 16, 2015 ... A singer often in need of a handy practice area, I sometimes vocalize in the subway (in addition to busking). The cathedral Person Train Operation). Click here for Bicycle Safety in the Subway �... 110 kilometers long.Traveling by subway is like traveling through�... ... times, trains are operated by one person. Click here to find out more about OPTO (One Art in the subway. The Stockholm subway system is said to be the world's longest art exhibit There are 24 train services in the subway system, including three short shuttles. Each route has a color and a local or express designation representing the�... like acoustics of�...	Don't talk to any strangers on the subway. I've just been spending time on the subway, riding in circles. I will sing for quarters on the subway. Every single necklace I wore on the subway got ripped right off. Look at this backpack I found on the subway. What happened to all those people on the subway... I mean, the murders on the subway were a spectacle, an announcement. Close the shade... and pretend you're on the subway.

in the subway

1291,000 results on the web

on the subway

120,400,000 results on the web

More popular!

Apr 16, 2015 ... A singer often in need of a handy practice area, I sometimes vocalize in the subway (in addition to busking). The cathedral
Person Train Operation). Click here for Bicycle Safety in the Subway �...
110 kilometers long.Traveling by subway is like traveling through�...
... times, trains are operated by one person. Click here to find out more about OPTO (One
Art in the subway. The Stockholm subway system is said to be the world's longest art exhibit
There are 24 train services in the subway system, including three short shuttles. Each route has a color and a local or express designation representing the�...
like acoustics of�...