Q. If D is distance between centres of two parallel tracks of gauge G with entire curved leads and equal angles of crossing, total length of crossover, is (Solved)
1. D (4R - 2G - D)]
2. D (3R - 2G -D)]
3. D (3R + 2G - D)]
4. D (4 + 2G - D)]
- a. D (4R - 2G - D)]