Dont confuse yourself with belapur. Belapur and badlapur are two different stations. Belapur is on the harbour line, and Badlapur is on the central line after Kalyan. You need to take a karjat bound train to reach Badlapur.

Here is a list of trains that start from CST and  terminate at Badlapur, so you dont have to get off at Kalyan and change trains.

Time S / F Time S / F Time S / F Time S / F Time S / F
04:55 S 06:16 F 07:55 S 08:30 F 09:01 S
09:16 F 09:40 S 09:48 F 10:18 F 10:48 F
11:53 F 13:18 S 13:49 S 14:22 S 15:29 S
16:30 F 17:24 S 17:55 F 18:39 F 19:17 F
19:25 F 19:38 S 21:10 S 21:37 S 22:00 S

Legend

S – Slow Train

F – Fast Train