3,500 gallons was only just sufficient for the run from Waterloo to Bournemouth without taking water so in 1901 a number of the six wheel tenders were transferred to the new-build K10 class 4-4-0s and replace behind the T9s with brand new 4,000 gallon bogie "water cart" tenders, leaving just 23 locos with six wheel tenders. This last 23 locos were subsequently given "water cart" tenders from the L11 class 4-4-0s.

Following the formation of the Southern Railway in 1923 a number of T9s were allocated to the Central and Eastern sections. In 1925 ten went to the Eastern Section whose turntables were too short to accomodate T9s with "water cart" tenders, so the "water carts" were swapped for 3,500 gallon six wheelers from the 700 class 0-6-0s whilst the T9 "water carts" went to ten L11 class locos and the ten six wheeler L11 class tenders were fitted to the ten 700 class locos that had donated their tenders to the T9s! Then in 1928 a further six T9s were allocated to the Central Section with, once again, tenders being changed, this time in a straight swap with six K10 locos. Eventually the six-wheeled tender T9s returned to the Western section but in the main kept the six wheel tenders.

Information on specific loco/tender pairings prior to the mid-thirties is hard to come by. The table below sets out what is known but most of the tenders will most probably have been attached to the loco concerned since the change to the "water carts" from 1901, or since new in the case of the fifteen locos from N°300 to N°338: