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Federal Signal Inc: 2001-SRNB

1st gen also known as 2001-DC Roundback, was a first model of 2001's And had coded option which was taken out in 2nd and newer series & Also had Thunderbolt rotator , The 1st gen's was eventually replaced by 2nd gen a.k.a squareback DC and lost it coded option

2nd Gen Second generation had squareback housing, This one known as normal 2001-DC but mainly called 2001-SRN/DC, 2nd Gen's is basically same as roundback except just squareback housing & had no coded option's

3rd Gen had different motor housing, and lost Screen as it was probably useless

4th Gen had eliminated 2001-DC Sticker, Slim down rotator and horn

SRNB's had newer Rotator as older 2001-SRN (thunderbolt) Rotator was outdated heavily, and Used no belt for rotator, Late models had big FS Logo, Eventually replaced with newer version a.k. 2001-130

Taller squareback & higher power and was rather louder as it reached 130 decibels

1st Gen 2001-SRN/DC: 1987-1988
2nd Gen 2001-SRN/DC : 1988-1998
3rd Gen 2001-SRN/DC : 1998-2001
4th Gen 2001-SRN/DC : 1998-2003
2001-SRNB : 2003-2007
2001-130 : 2007-Present