I have made some modifications in the English text, options are in the braces.

New York City MTA

Sab log har jagah New York City men rel gari se jate hai. Rel gari bahut tez aur susti hai. Kabhi kabhi, ek faqir ya beghar admi rel gari men soga. Asal men, aksar jab ek beghar admi rel gari men sota hai, vo bahut badboo hai aur koi nahin us bogi men jate hai. jab yeh hui, pulis aege. Is lie keh jab koi rel gari men sota hai, yeh bahut sangeen jerm hai.

Corrections:

All people in NYC go everywhere by train (subway).  [some use other means like cars, taxi, motor bike, bus etc. so I have changed "all people" to "majority of the people"]

Aksar log new york men rel gari se safar karte hen. 

Trains are very fast and inexpensive.

Rel gari ka safar bohat tez aur sasta he. [it is the journey that is inexpensive, the train itself can be very expensive :) ]

Sometimes, a begger or homeless man will sleep on the train. 

kabhi kabhi (kabhi kabhar) koi bhikari ya be ghar aadmi (shakhs) rel gari men so jata he.

In fact, sometimes, when a homeless man sleeps on a train, he smells very bad and no one will go in that train-car.

Asal men (dar haqiqat) jab koi beghar aadmi rel gari men sota he to us se bohat bad boo aati he aur (is liye) koi is rel gari men nahin jata.

[avoiding repetition: is soorat men koi rel gari men nahin jata ... = in this case no one will go ....)

When this happens, police come. 

Jab aisa hota he to police aa jati he.

 This is because when someone is sleeping on a train, it is a serious crime.

kiyoonke rel gari men sona aik sangeen jurm he (= because sleeping in the train is a serious crime).