07/23/2026
This post is the most controversial post we ever published. And this is odd, because we've previously published this post. I see a lot of the comments are about nuance between Model D7 vs. MD7 and 17A vs. 17 A series. And one person has just written me "Don't you have anyone there who knows about equipment?" I encouraged him to address his criticism to the community and to the author of the post: Frank Rooney. I already responded to him our membership is largely composed of people who've been working with construction equipment for decades. And if he truly believed we're a bunch of fans instead of a bunch of experts, he should call out the association as such.
Pictured here is a 1957 Caterpillar Model D7 (17A series) equipped as a model 572 Side Boom Pipelayer.
In August 2000, this machine was generously donated to the Historical Construction Equipment Association of Canada by McNally Construction Ltd., Hamilton, Ontario, and is currently on static display at the Simcoe County Museum near Barrie, Ontario.
With 97.5 kW (130 hp) and with approximately 3,600 kilograms (8,000 pounds) of counter weight, this pipelayer’s lift capacity was rated at 24,000 kilograms (54,000 pounds). Utilized on major oil and gas pipeline construction sites across Canada, these specialized lifting devices also saw service in pipeline repair service and on related construction sites worldwide. Heavy lift capability combined with excellent stability and ease of quick relocation by float continue to make these machines the mainstay of pipeline contractors.
In addition to this piece of antique equipment, Patrick McNally, long time member of HCEA Canada and CEO of McNally Construction also arranged the donation of a 1950s era Caterpillar D6 bulldozer and most recently, a 1950 Link Belt Model 365 crane also on display at the Simcoe County Museum.