NPBL 101-115:
NPBL 101-105 - built 12/1955-1/1956 - serial numbers 21021-21025:
| NPBL 101 | NPBL 102 | NPBL 103 | NPBL 104 | |
| NPBL 105 |
NPBL 106-115 - built 3 & 6/1956 - serial numbers 21056-21065:
| NPBL 106 | NPBL 107 | NPBL 108 | NPBL 109 | |
| NPBL 110 | NPBL 111 | NPBL 112 | NPBL 113 | NPBL 114 |
| NPBL 115 |