Where is the exit of the railway station? What do you mean by "no two bows" between the two tracks?

Prohibition of double bows, railway terminology "Prohibition of double bows": Before the electric locomotive passes this standard, if the locomotive runs with double bows, one bow must be lowered; "Off": Before the electric locomotive passes this standard, the main circuit breaker must be turned off; "Harmony": The main circuit breaker of electric locomotive can only be closed after passing this standard. These three signs are located at the phase separation of the catenary. "No Pantograph" is used to prevent the locomotive from short-circuiting the power supply arms of two different phases (the two pantographs of the electric locomotive are directly connected), and "Off" and "On" are used to prevent the arcing between the pantograph and the catenary caused by over-phase electrification. "Because the railway power supply is single-phase power supply, so in order to avoid load imbalance in the power plant, switch to the other phase every 30 ~ ~ 50km! If the double bow will cause two-phase short circuit and burn down the substation! Although the distance between the two bows is not that big, it is a safety measure! '