1. Bo-Bo is unusual for IR, although older WAM/WAG classes were Bo-Bo or B-B.
2. Common wheel configuration is Co-Co. Co-Co means 6 axles in 2 bogies, each axle powered by a traction motor. WAP7, WAP4, WAP1, WAM4, WAG5, WAG9, WAG7, WCAMx, WDM2, WDM3A, WDG4, WDP4B/4D... locos are Co-Co.
3. WDP4 has a unique wheel configuration : Bo1-1Bo. Its bogies look like Co-Co but only axles 1, 2, 4 and 6 (from either ends) have traction motors.
4....
more... WAG6 series had unique wheel configurations too. WAG6A and 6B were Bo-Bo-Bo type locos and WAG6C was a Co-Co locomotive. Bo-Bo-Bo means 6 axles in 3 bogies (2 axles per bogie), again very unusual for IR.
5. Steam locos also had strange wheel configurations.