After finishing second on his first run as a four-year-old, Soviet Line was assigned weight of 125 pounds for the Hambleton Stakes, a Listed handicap over one mile at York Racecourse on 11 May.
He was sent to Ireland in August and produced a more promising effort in the Desmond Stakes at the Curragh, finishing third to Heart Lake and Bin Ajwaad, but being promoted to second when the "winner" was disqualified.
[10] Six days after his win at Kempton, Soviet Line was stepped back up in class for the Group Three Kiveton Park Stakes at Doncaster.
After being towards the rear on the final turn, Soviet Line forced his way through the field in the straight, took the lead inside the last 200 metres and won by one and three quarter lengths and a head from Nijinsky's Gold and Heart Lake.
[14] Soviet Line began his third season by making his first appearance at Group One level when he started 2/1 favourite for the Lockinge Stakes over one mile at Newbury on 21 May.
On his final appearance of the season he was sent to the United States for the Breeders' Cup Mile at Belmont Park and finished sixth of the thirteen runners behind Ridgewood Pearl.
In the spring of 1996, Soviet Line finished unplaced in the Abernant Stakes and was then beaten a short head by Gabr (to whom he was conceding six pounds) in the Sandown Mile.
On 18 May the gelding was ridden by Richard Quinn as he attempted to become the first horse in 25 years to win back-to-back runnings of the Lockinge Stakes and started the 13/2 third favourite behind Spectrum and Charnwood Forset.
Three weeks later he contested the Grade III Firecracker Handicap at Churchill Downs in which he was ridden by Pat Day and won by three and a half lengths from Volochine.
On 8 November he ran for the second time in the Breeders' Cup Mile (run that year at Hollywood Park Racetrack) and finished seventh behind Spinning World.
In 1998, Soviet Line began his season by finishing fifth in an allowance race at Gulfstream Park in March and then ran second to Lasting Approval in the Maker's Mark Mile Stakes at Keeneland in April.
He won an allowance at Belmont in June but then failed to repeat his 1997 win in the Firecracker as he was beaten a nose by the four-year-old Claire's Honor.
In July the gelding contested the Grade III Robert F. Carey Memorial Handicap at Hawthorne Race Course and started favourite against nine opponents.
Ridden by Shane Sellers he overcame "traffic" problems on the second turn before overtaking the front-running Fun To Run in the closing stages and winning by one and three quarter lengths with Wild Event in third.
In April he ran for the second time in the Maker's Mark Mile Stakes in which he was ridden by John Velazquez and started second favourite behind Trail City.
After racing in fifth place he moved up to second on the final turn and stayed on strongly in the straight to win by a nose and a neck from Trail City and Rob 'n Gin.