Bell Crank Lever- LH Assembly for ESCORTS Design BMBS. Drawing No.: Escorts Drg. No. 3EB9792 Alt- 00. Material and Specification: As per operation and maintenance manual of Escorts make BMBS for Freight Stock with Casnub Bogie; Doc. No. RED- RD- BS- 019- OM- 01; RDSO, s Spec. No. WD- 23- BMBS- 2008 ( Rev. 1 ) Amendment No. 1 of Sept., 2016