SHANGHAI TO HEFEI

I wish to go to Hefei by Train No D5456/D5457 leaving at 18.55 and reaching 21.18 but its starting from WENZHOU SOUTH, is this station in Shanghai or this train comes from WENZHOU SOUTH and stops at Shanghai Station and then go to Hefei? Pl confirm . If it comes to Shanghai then which Shanghai Station? Hongqiao or main Railway Station of Shanghai? Pl inform in detail.