In 1904 as the original line needed replacement the decision was taken to expand and electrify the line which at it's greatest extent stretched nearly 6km. The tramway eventually had a fleet of fifteen tramcars (one being a water car for works purposes) though some were badly damaged in a tramshed fire in 1916. Like most tramways the Chesterfield service struggled to maintain the condition of the line and pay creditors and switched to trollybuses and motorbuses in the mid-1920s, the tramway closing for good in 1927 .
|Information for 1904 Aston type cars|
|Engine:||2 Westinghouse 90M electric motors,
later 2 British Thomson-Houston RGE20 electric motors
(550v DC OHLE)
|Power:||50 hp (37 kW) later 80 hp (60 kW)|
The majority of the fleet consisted of twelve Aston type open double deck cars which were introduced in 1904 when the tramway was electrified. The fleet was strengthed in 1907 with two more double deck cars, the water car arriving in 1909. Finally in 1914 three new cars with covered top decks arrived. After the war the earlier cars had their top decks given covers.
One of Chesterfield's electric tram cars has been preserved (a horse drawn tram car also) at Crich Tramway Village. Number Seven was one of the original twelve Aston type cars. It was withdrawn in 1927 when the tramway was closed and became a holiday cottage  before being preserved in 1973. After a long restoration process it was returned to working order in 1997. Number 7 originally had an open top deck but had the deck covered in 1919 when it was repaired following the 1917 tramshed fire (see above).
|Chesterfield Tram #7|
|#7 has been restored to running order at Crich Tramway Village|
|Chesterfield Corporation Tramways livery|
|Another view of #7|
|Top floor of #7|
|Although the top floor is covered, platforms are still open to the elements|
 Barry Marsden, Chesterfield Tramways (Middleton Press, 2004) p. 2
 Marsden Fig. 118
 Marsden Fig. 120