engineering work的意思是“工程施工”“工程作业”，其中的work用单数或复数均可。如：

We will be operating a reduced service while engineering work takes place. 工程施工期间我们将减少车次。

The following trains will not run due to engineering work on weekends. 由于周末的工程施工，下列火车将停开。

Train services on Sunday will be restricted, because of engineering works. 由于有工程作业，星期日的火车服务将受到限制。