Densha de Go! 64 is one of many iterations of a train simulator found in arcades and across various consoles.
Here´s gameplay video by ShiryuGL
You need the xdelta program. Please see the tab applications if available.
You need the original ROM to patch:
Densha de Go! 64 (Japan)
Native (big-endian) byteorder.
Internal Checksum 17C54A614A83F2E7
Recommended Emulator for N64