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| The 4100/4200 series NABI Low Floors 2004 NABI 40-LFW |
| The 4100/4200 series was delivered in 2004. It consists of 110 buses numbered 4101-4210. They are the last buses delivered with the Detroit Diesel Series 50 engines. Bus 4210 has the Cummins ISM. All have the Allison B500R transmission. All are currently in service. |
| Bus 4102 on the 95X. |
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| Bus 4205 on the T (now the 120). |
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| Bus 4152 on the 204 at DLN station. |
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