Why is the reception of a radio not good in a running train?

Question

Your Options:
A. Coach is built of metals
B. transmissions are usually far away
C. Running trains produce too much of noise
D. Friction between wheels & railway lines produce interference in radio waves

Answer 1

You must read about Faraday cage

The problem with the question is that, under the proper conditions, any of these could be true (except you'd need very bizarre circumstances to make D probable -- still, with an electric train where the current goes through the wheels...). However, C and D are not problems with the reception itself (C is a problem with your ears not hearing the good music over the loud rattle).