In 1980, LEGO released 6 Service Packs Trains sets, all of these sets have been retired. For that year, the total price of all retail sets cost $35, today those sets are valued around $205, a growth of 488%.
Most valuable 1980 LEGO Service Packs Trains set
1106 Battery Tender for Trains $125.00
Largest 1980 LEGO Service Packs Trains set
1110 Four Locomotive Wheels 8 pieces
Most owned 1980 Service Packs Trains set
1107 Two Shunting Trip-Posts and One Signal
6 sets

1106 Battery Tender for Trains

Theme / Subtheme Service Packs / Trains
Year 1980
Pieces 2
Availability Retired
1106 LEGO Battery Tender for Trains
Retail $14.99
Value $125.00
Growth  +733.9%
Annual growth 3.8%

1107 Two Shunting Trip-Posts and One Signal

Theme / Subtheme Service Packs / Trains
Year 1980
Pieces 4
Availability Retired
1107 LEGO Trains Two Shunting Trip-Posts and One Signal
Retail $5.99
Value $14.59
Growth  +143.6%
Annual growth 6.0%

1108 Two Pairs of Magnetic Couplings

Theme / Subtheme Service Packs / Trains
Year 1980
Pieces 4
Availability Retired
1108 LEGO Trains Two Pairs of Magnetic Couplings
Retail $5.99
Value $12.65
Growth  +111.2%
Annual growth 1.8%

1110 Four Locomotive Wheels

Theme / Subtheme Service Packs / Trains
Year 1980
Pieces 8
Availability Retired
1110 LEGO Trains Four Locomotive Wheels
Retail $1.99
Value $7.46
Growth  +274.9%
Annual growth 3.1%

1111 Eight Rubber Rims for Locomotive Wheels

Theme / Subtheme Service Packs / Trains
Year 1980
Pieces 8
Availability Retired
1111 LEGO Trains Eight Rubber Rims for Locomotive Wheels
Retail $2.99
Value $22.65
Growth  +657.5%
Annual growth 3.7%

1119 Two Locomotive Piston Assemblies

Theme / Subtheme Service Packs / Trains
Year 1980
Pieces 6
Availability Retired
1119 LEGO Trains Two Locomotive Piston Assemblies
Retail $2.99
Value $22.95
Growth  +667.6%
Annual growth 3.5%