For 13 years, Tammy Mangham has transformed operations and terminals at Estes Express Lines. While her latest move doubles the amount of employees she oversees, and involves integrating new processes and teams, Mangham’s down-to-earth management style has allowed an almost seamless transition.
3 Elements of Effective Truck Terminal Management
What’s the secret recipe for success when managing a new truck terminal? Estes Express Lines' Dallas terminal manager shares her leadership philosophy.

Estes Express Lines' Dallas Terminal Manager Tammy Mangham oversees more than 300 employees.
Photo: Estes Express Lines
Estes has more than 22,000 employees, a fleet of more than 8,500 tractors and 34,000 trailers, and a network of over 270 terminals. About six weeks ago, Mangham was transferred from the carrier’s Irving, Texas, terminal overseeing about 160 employees, to its Dallas facility, where she now leads more than 300 employees. So, what’s the secret recipe for success when managing a new truck terminal?
Here are three elements of terminal management Mangham says make up her leadership philosophy.
1. Set Clear Expectations
If you speak to Mangham about her leadership style, even she gets tired of using the word “communication.” But there’s a reason it’s so important as a trucking terminal manager, especially one in charge of integrating members of other facilities into its operations. She believes communication is the building block for measured success.
“I learned that I had to treat people well, because there's a lot of hands doing what we do to get to the end results,” she explains. “I had to learn how to talk to certain people to get the best out of them. And that requires us knowing a little bit about employees. Communication is big.”
She adds: “Everything fails; even in our own personal life, when we don't communicate well.”
The first step for herself, and anyone reporting to her, is setting clear expectations of the job for everyone on the team.
“I always sit down when I take a role: what is it that you want for me? I want a clear understanding of what my responsibility is and what I am going to be held accountable to,” she explained. “I use those metrics and expectations that they give me as a guide.”
From those expectations, she sets up processes that allow her, and her whole team, to succeed.
2. Adhere to Processes
“Everyone sees things differently, but we need everyone to have the same vision,” Mangham says of creating a common goal to achieve. To make sure this happens, Mangham ensures there is a process for everything her terminal team does. It takes the guess work and stress out of success.
“I encourage [terminal employees] to set up a process,” she says. “I say: Let's follow it, and then our results, and everything that we work for, will come.”
3. Establish a “Can-Do” Attitude
With every new leadership change there can be some apprehension. Will the day-to-day duties of terminal employees change? Will they have to relearn all the programs or processes they’ve mastered?
Mangham said successfully introducing yourself as new leadership is all in the approach, and in the ability to establish a positive attitude in the terminal culture.
“The reality is — the way I manage things — I don’t go around fixing things that aren’t broken,” Mangham explained. “I’m going to watch things. I’m not going to come in here and change y’alls way of life. Even if I do have to change it, I’m not aggressive about it. I try to sell them on the message. And by the end of it, they’ll probably think that they came up with the idea. And that’s a win for me.”

Estes has a network of over 270 terminals.
Photo: Estes Express Lines
Mangham came to her Dallas post from smaller terminals which tend to have less resources. Because of this, she and her operations managers had to learn a lot of things firsthand. That’s something that has helped her relate to employees across the terminal, and has helped shape her management style and helps earn her respect.
“I expect my team to be the type of people that roll up their sleeves and help our employees out,” she said. “I just ask them to on board with that … and have an open mind.”
She says she tries to establish an environment of “yes people.”
“We find ways to say ‘yes’ to our customers and internal [employees],” she said. “If there’s a way to do it, we’re going to try to do it.”
More Fleet Management

BeyondTrucks Targets Rate Complexity with New AI RateAgents
BeyondTrucks says its new RateAgents can turn plain-language rate logic into working code, starting with fuel surcharges — a critical but notoriously complex piece of carrier revenue.
Read More →
Volvo Sees Market ‘Tipping Point’ as New VNL Orders Surge
Soft freight conditions persist, but aging fleets, strong order intake, and new-product momentum signal a more optimistic second half of 2026, Volvo Trucks North America says.
Read More →
Cargo Theft’s New Playbook: Strategic Fraud, Double Brokering, and Cybercrime Hit Trucking
Cargo theft is evolving from regional smash-and-grab operations to sophisticated fraud schemes. Strategic theft now accounts for roughly a third of cargo crime, with incidents rising sharply in recent years. Here’s how the schemes work — and what fleets can do to protect themselves.
Read More →
HDT Honors the Best New Products of 2025 at TMC [Photos]
Heavy Duty Trucking's Top 20 Products awards recognize the best new products and technologies. Check out the award presentations at the 2026 Technology & Maintenance Council annual meeting.
Read More →
Detroit Engines: Trusted Performance, Built for What's Next
The Detroit® Gen 6 engine platform proves that real progress doesn’t require a complete redesign. Built on 20 years of trusted technology, these engines are designed for efficiency, stronger performance, and greater reliability than before. And they do it all while complying with 2027 EPA standards on every mile.
Read More →
Q&A: What's Real in Advanced Truck Tech? ACT Expo's Erik Neandross Weighs In
The 2026 ACT Expo is focusing heavily on what organizer Erik Neandross calls trucking's digital frontier. This interview excerpt dives into artificial intelligence, zero-emission vehicles, and tips to make sense of it all.
Read More →
Trucking's Digital Frontier: AI, Connected Vehicles, Alternative Fuels and More
There's an amazing amount of new technology for trucking out there. For fleets, the challenge is figuring out what’s real, what’s hype, and what’s worth investing in.
Read More →
What's Real in Advanced Truck Technology? ACT Expo's Erik Neandross Weighs In
Artificial intelligence, the software-defined vehicle, telematics, autonomous trucks, electric trucks and alternative fuels, and more in this HDT Talks Trucking interview
Read More →
ACT: Trucking Volumes Rise, Capacity Tightens as Fuel Prices Cloud Outlook
ACT Research data shows volumes hitting a four-year high and supply-demand balance strengthening, but higher oil prices are undercutting tariff relief and tempering optimism.
Read More →
Wabash Teams Physical Security With Digital Tech For Better Cargo Visibility
The patent-pending cargo solution integrates a digitally connected cargo door and an intelligent locking system with the TrailerHawk.AI technology platform.
Read More →
