WP 3501-3544:
WP 3501-3510 - built 5/1966 - serial numbers 31662-31671:
| WP 3501 | WP 3502 | WP 3503 | WP 3504 | |
| WP 3505 | WP 3506 | WP 3507 | WP 3508 | WP 3509 |
| WP 3510 |
WP 3511-3516 - built 3/1967 - serial numbers 33056-33061:
| WP 3511 | WP 3512 | WP 3513 | WP 3514 | |
| WP 3515 | WP 3516 |
WP 3517-3521 - built 8/1970 - serial numbers 36824-36828:
| WP 3517 | WP 3518 | WP 3519 | ||
| WP 3520 | WP 3521 |
WP 3522-3526 - built 8/1970 - serial numbers 36783-36787:
| WP 3522 | WP 3523 | WP 3524 | ||
| WP 3525 | WP 3526 |
WP 3527-3544 - built 8-9/1971 - serial numbers 37838-37855:
| WP 3527 | WP 3528 | WP 3529 | ||
| WP 3530 | WP 3531 | WP 3532 | WP 3533 | WP 3534 |
| WP 3535 | WP 3536 | WP 3537 | WP 3538 | WP 3539 |
| WP 3540 | WP 3541 | WP 3542 | WP 3543 | WP 3544 |