Gear case assembly for Traction Motor type TAO- 659 with Roller Bearing arrangement ( TAOCHI ) ) as per RDSO Drawing No. SKEL- 4512 with stainless steel standard insert ( with out grip coil ) confirming to ELS/ BZA Drawing Nos. B/ TRS/ BOGE/ 3/ 305 Alt. B & B/ TRS/ BOGE/ 4/ 306 Alt. B.