User:XtraJovial/sandbox3

Background
Filler text

By February 2021, the 3000 series had become the most prominent commuter train operated by Odakyu at the time, with 346 cars built.

Batch 1
This batch consists of four 6-car sets (3251–3254) that were built by Nippon Sharyo in 2001.

Batch 2
This batch of sets was introduced in 2003, featuring external and internal changes over the previous batch. The passenger door width was unified to 1,300 mm, whereas the previous batch used a mixture of 1,300 and 1,600 mm passenger doors.

Subsequent batches
On 14 February 2004, Odakyu introduced into service a six-car set (3263) equipped with noise-dampening undercarriage covers. The introduction of this set followed an experiment conducted in 2002 to compare the effect of such covers on train running noise. It was observed that the covers reduced running noise by 3 decibels. This set was also built with additional improvements to reduce noise pollution, including re-geared traction motors and redesigned cooling fans.

10-car set introduction
Between 2010 and 2011, eight cars were delivered from Kawasaki Heavy Industries and used to form two 10-car sets—3091 and 3092 (formerly six-car sets 3280 and 3281, respectively). The first 10-car set, 3091, entered service on 20 January 2011.