The meaning of Railway signs you will find While travelling

Have you ever thought the signs you find while travelling on Trains. What does it exactly means?? 

Here are the list of Signs while you will find while travelling on train.

1. Level Crossing indicator

A black 'L' on a square yellow board indicates approach to a level crossing.

2. Whistle Indicators

'W', or 'W/L' on a square yellow board. The 'W' is a general 

whistle indicator while the 'W/L' stands for  Whistle for Level 

Crossing. The latter is also seen in Hindi with the characters 

'see/pha' == 'seetee bajao - phatak'). 

Usually provided on approach to unmanned level crossings 

(and for manned level crossings without a  clear view) about 

250m away from the level crossing.  Similarly, a 'W/B' sign is 

seen (less often) on approach to a bridge.

4. Caution Order for Tunnel

C/T' in black on a round yellow board. Caution Order in effect inside a tunnel; the sign is placed just outside the entrance to the tunnel. It is not known if this sign is used on any railway other than on Konkan Railway.

5. Termination Indicators

T/P, T/G, or T/BOXN (painted on a yellow circular board) : Termination of speed zone for, respectively, passenger trains, goods trains, and goods trains with BOXN wagon rakes. In urban areas similar signs such as T/EMU, T/EMU-9, etc., may be seen (termination of speed limit for EMU rakes, EMU rakes with 9 coaches, respectively). Other termination indicators seen include T/PG (for both passenger and goods trains, seen on ECoR), T/P24 (for 24-coach or longer passenger trains), and T/L (for local, i.e., suburban trains, usually EMU or DMU trains). The Hyderabad area MMTS system uses a T/M sign for its trains. T/R is sometimes seen for railbuses. Occasionally, the sign T by itself is shown to indicate a termination of speed limit for all trains. A T/Raj sign was in use for Rajdhani trains when they were first introduced but is no longer used now. WR used T/Raj indicators for the 8-coach Bombay - New Delhi Rajdhani, and its EMUs used the same sign as a termination indicator.