The sequence of trains that run between metro cities like Delhi, Chennai and others start from the digit “4”.
Sequence starting from 5
The normal passenger trains have their sequence starting from “5”
Sequence starting from 6
MEMU (Mainline Electric Multiple Unit) trains have a sequence starting from 6.
Sequence starting from 7
DEMU (Diesel Electric Multiple Unit) trains have a sequence number starting from 7.
Sequence starting from 8
This sequence tells about the reserved position of the train.
Sequence starting from 9
The trains with sequence starting from 9 run between Mumbai’s suburban areas.
However, this is not the only nomenclature used in our country and there are some others also.
Sometimes the first two digits of a sequence represent the manufacturing year of the train. Like a train with number 05052 means that it was manufactured in 2005. A train with the sequence 8239 means it was made in 1982.
There is a separate nomenclature for AC trains also. Have a look-