In 1996, LEGO released 3 Service Packs Trains sets, all of these sets have been retired. For that year, the total price of all retail sets cost $11, today those sets are valued around $67, a growth of 511%.
Most valuable 1996 LEGO Service Packs Trains set
5309 Wagon Plate Red 6x28 $27.04
Largest 1996 LEGO Service Packs Trains set
5310 Light Brick Conductor 9V 4 pieces
Most owned 1996 Service Packs Trains set
5311 Two 2x2 Plates with Wire 25.6 cm
3 sets

5309 Wagon Plate Red 6x28

Theme / Subtheme Service Packs / Trains
Year 1996
Pieces 1
Availability Retired
5309 LEGO Trains Wagon Plate Red 6x28
Retail $2.99
Value $27.04
Growth  +804.3%
Annual growth 4.0%

5310 Light Brick Conductor 9V

Theme / Subtheme Service Packs / Trains
Year 1996
Pieces 4
Availability Retired
5310 LEGO Trains Light Brick Conductor 9V
Retail $4.99
Value $13.78
Growth  +176.2%
Annual growth 4.7%

5311 Two 2x2 Plates with Wire 25.6 cm

Theme / Subtheme Service Packs / Trains
Year 1996
Pieces 1
Availability Retired
5311 LEGO Trains Two 2x2 Plates with Wire 25.6 cm
Retail $2.99
Value $26.25
Growth  +777.9%
Annual growth 6.1%