The 205 buses might be numbered 3500-3704. As the MTA purchases more and more electric buses, they will take over most of the Orion’s numbers, while the new XD60 order will probably take over the NYCT OG HEV’s numbers. EDIT: MTA has renumbered the five Nova electrics from 5100-5104 to 5025-5029 and XE40 #5030 was delivered to Grand Avenue. Looks like these buses will be numbered 5030-5234.