Power plant producing electric power for relativistic trams says: Trams have large longitudinal relativistic masses, that's why it takes a lot of energy to accelerate a tram.

This is based on Doppler shift of EM-waves and the fact that said waves have momentum:

A tram moving away from the power plant says: I am not receiving much energy from those overhead AC-lines, the frequency is low and so is voltage. But the momentum of the energy is pushing me forwards with a small force.

A tram moving towards the power plant says: I am receiving lot of energy from those overhead AC-lines, the frequency is extra high and so is voltage. But the momentum of the energy is pushing me backwards with a large force.

Power plant producing electric power for relativistic trams says: Trams have large longitudinal relativistic masses, that's why it takes a lot of energy to accelerate a tram.

This is based on Doppler shift of EM-waves and the fact that said waves have momentum:

A tram moving away from the power plant says: I am not receiving much energy from those overhead AC-lines, the frequency is low and so is voltage. But the momentum of the energy is pushing me forwards with a small force.

A tram moving towards the power plant says: I am receiving lot of energy from those overhead AC-lines, the frequency is extra high and so is voltage. But the momentum of the energy is pushing me backwards with a large force.

(Energy flows in the overhead line and tram moves either to the upstream direction, "towards the plant" or to the downstream direction, "away from the plant")

Power plant producing electric power for relativistic trams says: Trams have large relativistic mass, that's why it takes lot of energy to accelerate a tram.

This is based on Doppler shift of EM-waves and momentum of said waves:

A tram moving away from the power plant says: I am not receiving much energy from those overhead AC-lines, the frequency is low and so is voltage. But the momentum of the energy is pushing me forwards with a small force.

A tram moving towards the power plant says: I am receiving lot of energy from those overhead AC-lines, the frequency is extra high and so is voltage. But the momentum of the energy is pushing me backwards with a large force.

Power plant producing electric power for relativistic trams says: Trams have large longitudinal relativistic masses, that's why it takes a lot of energy to accelerate a tram.

This is based on Doppler shift of EM-waves and the fact that said waves have momentum:

A tram moving away from the power plant says: I am not receiving much energy from those overhead AC-lines, the frequency is low and so is voltage. But the momentum of the energy is pushing me forwards with a small force.

A tram moving towards the power plant says: I am receiving lot of energy from those overhead AC-lines, the frequency is extra high and so is voltage. But the momentum of the energy is pushing me backwards with a large force.