The correct coach composition of this train is :
LOCO-HCPV-SLR-GEN-S1-S2-S3-S4-S5-S6-S7-S8-S9-S10-PC-B1-B2-A1-GEN-GEN-SLR
12869 HOWRAH SUP EXP departs from platform no : 18 in Mumbai CST (CSTM)
And reverse in opposite direction for 12870 HWH CSTM EXPRESS