In 1989, LEGO released 3 Service Packs Monorail sets, all of these sets have been retired. For that year, the total price of all retail sets cost $40, today those sets are valued around $286, a growth of 616%.
Most valuable 1989 LEGO Service Packs Monorail set
5040 Monorail Motor 9 V $196.61
Highest growth 1989 Service Packs Monorail set
5039 Monorail Stop / Reverse Switch +803.01%
3 sets

5039 Monorail Stop / Reverse Switch

Theme / Subtheme Service Packs / Monorail
Year 1989
Pieces 3
Availability Retired
5039 LEGO Monorail Stop / Reverse Switch
Retail $5.99
Value $54.09
Growth  +803.0%
Annual growth 5.9%

5040 Monorail Motor 9 V

Theme / Subtheme Service Packs / Monorail
Year 1989
Pieces 1
Availability Retired
5040 LEGO Monorail Motor 9 V
Retail $29.99
Value $196.61
Growth  +555.6%
Annual growth 5.4%

5041 Space Track Connector Lead 9V 10 cm

Theme / Subtheme Service Packs / Monorail
Year 1989
Pieces 1
Availability Retired
5041 LEGO Monorail Space Track Connector Lead 9V 10 cm
Retail $3.99
Value $35.53
Growth  +790.5%
Annual growth 7.2%