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 $4,942.
Most valuable 1968 LEGO Trains 4.5V set
118 Electronic Train $1,754.76
Highest growth 1968 Trains 4.5V set
118-2 Small Train Set +10008.06%
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 $235.15
Growth  +1521.7%
Annual growth 5.2%

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 $1,319.40
Growth  +6500.3%
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 $1,754.76
Growth  +8695.8%
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 $1,566.75
Growth  +10008.1%
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

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 $49.61
Growth  +1704.0%
Annual growth 4.5%

160 Magnetic Couplings

Theme / Subtheme Trains / 4.5V
Year 1968
Pieces 6
Availability Retired
160 LEGO Trains Magnetic Couplings
Retail $1.00
Value $16.45
Growth  +1545.0%
Annual growth 5.9%