The four-week long scheme involved hundreds of engineers working along the six-mile route to install over 200 masts and supporting cantilevers, along with stringing overhead power lines.
The scheme is part of the wider programme to electrify the lines linking Stirling, Alloa and Dunblane to Glasgow and Edinburgh, scheduled to be complete in 2019.
Transport Minister Humza Yousaf said: "I want to thank passengers for their cooperation and patience while alternative travel arrangements were in place. It will be welcome news that these works have been completed on time.
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"Over this four week period Network Rail crews worked tirelessly to safely and successfully install over 200 masts and 14 kilometres of overhead wiring, taking us a step closer to electric services on the Stirling to Alloa route by December 2018."
Paul Reilly, Network Rail programme manager, said: "Electrification will transform travel across the central belt of Scotland and is part of our commitment to delivering the best railway Scotland has ever had.
"Our engineers worked around-the-clock to complete this complex programme as quickly as possible in what were, at times, challenging weather conditions.
"We understand the inconvenience these works cause to some passengers and residents and we appreciate the patience they have shown while we delivered this vital element of our electrification programme."
(LM)
