In 1968, LEGO released 7 Trains 4.5V sets, all of these sets have been retired. For that year, the total price of all retail sets cost $101, today those sets are valued around $6,652, a growth of 6474%.
Most valuable 1968 LEGO Trains 4.5V set
119 Super Train Set $2,236.73
Highest growth 1968 Trains 4.5V set
118-2 Small Train Set +9430.13%
Most owned 1968 Trains 4.5V set
118 Electronic Train
7 sets

102 4.5V Motor Set

Theme / Subtheme Trains / 4.5V
Year 1968
Pieces 24
Availability Retired
102 LEGO Trains 4.5V Motor Set
Retail $14.50
Value $238.22
Growth  +1542.9%
Annual growth 5.0%

116-2 Deluxe Motorized Train Set

Theme / Subtheme Trains / 4.5V
Year 1968
Pieces 360
Availability Retired
116-2 LEGO Deluxe Motorized Train Set
Retail $19.99
Value $1,220.62
Growth  +6006.2%
Annual growth 7.5%

118 Electronic Train

Theme / Subtheme Trains / 4.5V
Year 1968
Pieces 110
Availability Retired
118 LEGO Electronic Train
Retail $19.95
Value $1,395.54
Growth  +6895.2%
Annual growth 6.9%

118-2 Small Train Set

Theme / Subtheme Trains / 4.5V
Year 1968
Pieces 451
Availability Retired
118-2 LEGO Small Train Set
Retail $15.50
Value $1,477.17
Growth  +9430.1%
Annual growth 8.3%

119 Super Train Set

Theme / Subtheme Trains / 4.5V
Year 1968
Pieces 436
Availability Retired
119 LEGO Super Train Set
Retail $27.50
Value $2,236.73
Growth  +8033.6%
Annual growth 8.0%

156 2 Signals with Automatic Stop / Go Attachment

Theme / Subtheme Trains / 4.5V
Year 1968
Pieces 6
Availability Retired
156 LEGO Trains 2 Signals with Automatic Stop / Go Attachment
Retail $2.75
Value $63.81
Growth  +2220.4%
Annual growth 5.2%

160 Magnetic Couplings

Theme / Subtheme Trains / 4.5V
Year 1968
Pieces 6
Availability Retired
160 LEGO Trains Magnetic Couplings
Retail $1.00
Value $20.28
Growth  +1928.0%
Annual growth 6.0%