Train services have come to a halt in Christchurch after anti CPTPP protesters locked themselves to train tracks.
Six people are involved in the protest at the intersection of Lincoln Rd and Moorhouse Ave.
One of the protesters is Josie Butler, who made headlines for throwing a sex toy at National MP Steven Joyce at Waitangi in 2016.
A KiwiRail spokesperson says its services near the suburb of Middleton have been suspended because of the protestors.
Police have been notified and one freight service will be held until police clearance is received, KiwiRail says.
"We've done this to protest the CPTPP, which we think needs to be stopped in its tracks," Ms Butler told Newshub.
"The CPTPP is the same thing as the TPP.
"Our main concerns about this are the increase in dairying - that's our major export, so we're going to see the degradation of our waterways.
"Also of concern is climate change. You cannot address climate change without addressing trade - trade's where the carbon emissions happen."
Ms Butler said she's disappointed Labour and New Zealand First now support the CPTPP.
"Personally, I am quite disappointed in that, particularly considering they came to our marches and protested against it."
The group alerted train operators to the protest in advance.